Bitcoin runs on electricity, not internal combustion engines. Bitcoin’s use of energy is no more or less damaging to the environment than any other electricity user in the same area.

Bitcoin uses a public ledger making it a terrible choice for crimes. While not everyone wants to directly accept bitcoin there are exchanges throughout the world happy to exchange it for local currency. Bitcoin is not backed by violence like state currencies. It takes time for a new form of value to gain widespread acceptance.

Gold was used as a currency for thousands of years but you can’t use it at a local grocery store either.

Bitcoin’s value is backed by math and computers and that is somehow worse than the energy and violence used by governments?

Can you use us dollars in a grocery store in the eu? Does that mean the dollar has no value?

Value is only what people agree to. State mandated currency is no more real than any other currency.

Bitcoin was created to enable payments based upon cryptographic proof rather than trust, and doesn’t need additional applications. Mining has always been a race which is why long ago people figured out how to mine on GPUs - it was faster than mining on CPUs. Then onto ASICS. If people mined less than difficulty would adjust downwards and mining has nothing to do with liquidity.